Punch.



No. '1770,239. PATENTED SEPT. 13, 1904.

- T. H. LOVEJOY.

PUNCH.

Arrmou'lon FILED In 5, 1904.

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UNITE Srnrns Patented September 13, 1904.

PUNCH.

SPECIFICATION forming part of Letters Patent No. 770,239, datedSeptember 13, 1904. Original application led September 23, 1903, SerialNo. 174,261. Divided and this application filed May 5, 1904. Serial To@ZZ whom, t puny con/cern:

Be it known that I, THOMAS I-I. LovnJoY, a citizen of the United States,residing in Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Punches, of which the followingis a specification.

My invention relatesto improvements in punches for punching holes inmetal.

Metal-punches have heretofore generally been made in the form of a solidtool or punch which is secured to the stock by a threaded coupling ornut, a separate tool or punch being required for each different size ofhole desired to be formed. This requires a very large number of punchesor tools and also considerable expense, and if one of the punches ortools of a larger size happens to break, although the fracture may occurat its point or smaller end, the whole tool is ruined and requires to bethrown away. Also in the larger sizes of solid punches difiiculty isfrequently experienced in properly hardening and tempering the toolwithout causing internal strain, weakness, and liability to fracture.

The object of my invention is to provide a compound metal-punch so thatthe same punch may be used for punching holes of a plurality of di'erentsizes and so that in case of breakage, which usually occurs at thesmaller' or pointed end of the punch, only a comparatively small andinexpensive piece of the hardened tempered tool-steel will be lost, thuseffecting a very great saving of expense.

My invention consists in the means I employ to accomplish thisresult4that is to say, it consists, in connection with the punch-stockand threaded coupling or nut, of a hollow punch or punch-shell andasmaller solid punch fitting or nesting in the hollow punch or shell anda thrust-block fitting in the hollow punch or shell and interposedbetween the smaller solid punch and the punch-stock, so that the smallersolid punch will serve, in combination with the hollow punch or shell,as the lower or pointed end thereof in making larger holes of the sizeof the shelland also serve as the (No model.)

small punch in making' holes of the size of the solid punch.

My invention further consists in the novel construction of parts anddevices and in the novel combinations of parts and devices herein shownand described.

As the punch-shell which is used in my in` vention in forming thelarger-sized holes is hollow, it will be readily understood that it canbe easily hardened and tempered without danger or injury, and as in myinvention any breakage of the punch-point only affects the small solidpunch, which is a comparatively small piece of tool-steel, it can beremoved at little expense, and the punch-shells, which are the largerand more expensive pieces, are seldom liable to fracture.

In the accompanying drawings, forming a part of this specification,Figure 1 is a side elevation, partly in vertical section, of a punchembodying my invention. Fig. 2 is a central vertical section through thecompound punch. Fig. 3 is a section on line 3 3 of Fig. 2, and Fig'. 1is a detail perspective view of the small solid punch.

YIn said drawings, A represents the die; X, the plate of steel or othermetal to be punched; A2, the stripper-plate; B, the threaded coupling ornut, and C the stock to which the punch is secured by the coupling ornut and by which it is reciprocated or operated.

` D is a hollow punch or punch-shell used for making' larger-sizedholes, and D is a smaller solid punch fitting and nesting in the hollowpunch or shell l).

F is a thrust-block interposed between the smaller solid punch Dl andthe threaded stock C, thethrust-block F fitting in the hollow punch orshell D and abutting at its lower end against the head d of the lower orsolid punch D and abutting at its upper end directly against thethreaded stock C.

The head (Z of the'solid punch D has a conical or flaring exteriorshoulder cZ, iitting the corresponding interior beveled shoulder Z2 ofthe hollow punch or shell D, and the head or upper end Z3 of the hollowpunch or shell D has a corresponding exterior beveled shoulder di,fitting the corresponding interior beveled shoulder Z) of the couplingor nut B.

I clairn- 1. In a punch, the combination with the punch-stock andthreaded coupling or nut having an internal shoulder, of a hollow punchhaving an external shoulder or head engaging the internal shoulder ofthe coupling, and provided with an internal shoulder, and a smallersolid punch fitting and nesting in the hollow punch and having anexternal shoulder or head engaging the internal shoulder 'of the hollowpunch, and a thrust-block fitting in the hollow punch and abutting' atone end against the stock and at its other end against the solid punch,substantially as specified.

2. The combination with a punch-stock and coupling, of a hollow punchconnected to the punch-stock and coupling, and provided with an internalshoulder, of a smaller solid punch iitting and nesting in the hollowpunch and provided with an external shoulder or head on the punch-shell,and a thrust-block F fi't.

ting within said punch-shell, and abutting at one end against thepunch-stock and its other end against said punch D', Substantially asspecified.

THOMAS H. LOVEJOY. Witnesses:

H. M. MUNDAY, E. D. ADoooKj-

